<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>头部部分</title>
</head>
<body>
<div id="top" th:fragment="top">
    <div id="top_bar">
        <nva>
            <span>
                <a href="/admin/login/show">进入后台</a>
            </span>
            <span> | </span>
            <span>注册</span>
            <span> | </span>
            <span>登录</span>
        </nva>
    </div>
</div>
</body>
</html>